#include <iostream>
#include <string>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <cstring>
void Usage(std::string proc)
{
  std::cout << "Usage:\n\t" << proc << " serverip serverport\n"
            << std::endl;
}
// ./tcpclient serverip serverport
int main(int argc, char *argv[])
{
  if (argc != 3)
  {
    Usage(argv[0]);
    exit(1);
  }
  std::string serverip = argv[1];
  uint16_t serverport = std::stoi(argv[2]);

  int sockfd = socket(AF_INET, SOCK_STREAM, 0);
  if (sockfd < 0)
  {
    std::cerr << "socket error" << std::endl;
    exit(2);
  }

  // 构建目标主机的socket信息
  struct sockaddr_in server;
  memset(&server, 0, sizeof(server)); // bzero
  server.sin_family = AF_INET;
  server.sin_port = htons(serverport);
  server.sin_addr.s_addr = inet_addr(serverip.c_str());

  int n = connect(sockfd, (struct sockaddr *)&server, sizeof(server));
  if (n < 0)
  {
    std::cerr << "connect error" << std::endl;
    exit(3);
  }

  while (true)
  {
    std::cout << "Please Enter# ";
    std::string outstring;
    std::getline(std::cin, outstring);

    ssize_t s = send(sockfd, outstring.c_str(), outstring.size(), 0); // write
    if (s > 0)
    {
      char inbuffer[1024];
      ssize_t m = recv(sockfd, inbuffer, sizeof(inbuffer) - 1, 0);
      if (m > 0)
      {
        inbuffer[m] = 0;
        std::cout << inbuffer << std::endl;
      }
      else
        break;
    }
    else
    {
      break;
    }
  }

  ::close(sockfd);
  return 0;
}